Write a simple linear regression line $($equation$).$ Define Y$,$ a$,$ b$,$ and x $($t$).$

Define r$,$ r squared, and adjusted r

Define MAD, MSE, MAPE, why these are important?

Among other services and products that Karl's Copiers provides, it sells and repairs photocopy machines. It is now the end of December, $2021$ and the manager needs to plan his service staffing for January, $2022.$ The manager first needs to forecast the number of service calls for January, $2022.$ Following are the record of service calls for the past $12$ months